50261397721 has 2 divisors, whose sum is σ = 50261397722. Its totient is φ = 50261397720.

The previous prime is 50261397677. The next prime is 50261397731. The reversal of 50261397721 is 12779316205.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43328504025 + 6932893696 = 208155^2 + 83264^2 .

It is a cyclic number.

It is not a de Polignac number, because 50261397721 - 2¹¹ = 50261395673 is a prime.

It is not a weakly prime, because it can be changed into another prime (50261397731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25130698860 + 25130698861.

It is an arithmetic number, because the mean of its divisors is an integer number (25130698861).

Almost surely, 2^50261397721 is an apocalyptic number.

It is an amenable number.

50261397721 is a deficient number, since it is larger than the sum of its proper divisors (1).

50261397721 is an equidigital number, since it uses as much as digits as its factorization.

50261397721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 50261397721 in words is "fifty billion, two hundred sixty-one million, three hundred ninety-seven thousand, seven hundred twenty-one".